18520050505 has 16 divisors (see below), whose sum is σ = 24247076544. Its totient is φ = 13467657280.

The previous prime is 18520050457. The next prime is 18520050511. The reversal of 18520050505 is 50505002581.

It is not a de Polignac number, because 18520050505 - 2⁷ = 18520050377 is a prime.

It is a Duffinian number.

18520050505 is a modest number, since divided by 50505 gives 18520 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 943602 + ... + 963028.

It is an arithmetic number, because the mean of its divisors is an integer number (1515442284).

Almost surely, 2^18520050505 is an apocalyptic number.

It is an amenable number.

18520050505 is a deficient number, since it is larger than the sum of its proper divisors (5727026039).

18520050505 is a wasteful number, since it uses less digits than its factorization.

18520050505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36776.

The product of its (nonzero) digits is 10000, while the sum is 31.

The spelling of 18520050505 in words is "eighteen billion, five hundred twenty million, fifty thousand, five hundred five".